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1  Community / Exhibition / Gallery / Re: Core memory shield on: May 16, 2011, 02:19:18 am
Well done, lovely project and so well written  !!
2  Community / Exhibition / Gallery / Re: Guided Rocket on: May 06, 2011, 04:29:57 am
Modified a model rocket with movable fins and an Arduino Pro Mini with an accelerometer to keep the rocket flying straight.  The link has all the info and videos.  Let me know what you think.
http://sites.google.com/site/airwavershr/Home/guided-rocket

Well done !
A couple of questions:
-Is that a breadboard ?
-It seems you are using a 9V battery ? It must be something lighter/smaller available.. but I don't know what. If someone could help with this I would appreciate.
3  Community / Exhibition / Gallery / Re: DIY MP3/OGG/FLAC player using Arduino and VS1053 on: May 02, 2011, 01:04:30 pm
Yes it is very useful, thanks for posting !!
4  Using Arduino / General Electronics / Help with gerber files needed by PCB manufacturers on: April 28, 2011, 12:42:55 pm
I'm learing how to design PCBs with Eagle.

More or less now I begin to understand Eagle and can create PCBs, new libraries etc.
I've done a home-made single layer PCB and as a next step I would like to order a slightly more complex circuit (with the free Eagle version, two layers).

I have the book "Build your own PCB" by Al Williams and there are some guidelines to prepare Gerber files (.cmp, .sol, .plc...). However, I also downloaded the SparkFun CAM file and it generates a totally different set of filename extensions. So right now I'm really confused !

My questions are:
1-Is there a set of standard gerber files ?
2-How do you review and verify your files before submitting them ?
3-Is someone out there accepting Eagle files ? (In case this makes sense)

If someone who has ordered PCBs could help me I would really appreciate it.

Thanks,

5  Community / Exhibition / Gallery / Re: Interactive talking Portal Turret plushie on: April 25, 2011, 04:08:39 pm
It will be a sort of talking alarm clock but sound quality has to be reasonably good, good enough so that you may think there is actually a person in the room. I'll use an external amplifier instead of the loudspeaker.
6  Community / Exhibition / Gallery / Re: 441 water drops on: April 25, 2011, 03:48:16 pm
Really nice !
Can you give us some details about the positioning system ?
7  Community / Exhibition / Gallery / Re: Interactive talking Portal Turret plushie on: April 25, 2011, 03:42:13 pm
Nice project !
Would you recommend the Adafruit Wave Shield ? I was considering to use it.
8  Using Arduino / Project Guidance / Re: Xbee vs Wishield vs Wifly shield on: April 19, 2011, 05:17:46 am
I'm also interested in wifi shields. Any recommendations ?
9  Using Arduino / Project Guidance / Small cell to power Arduino Nano ? on: April 15, 2011, 03:38:25 am
Hi,
I'm working on a small data logger with an Arduino Nano. The first idea was to power it using a 9V 6LR cell but it is slightly too large and I don't really need 9V, only 6. Another idea was to use 2 button cells but the circuit needs about 20mA and this seems to be too much for button cells. Thanks !
What cell would you use ?
10  Community / Exhibition / Gallery / Re: Reading Raw Clock LCD Signals on: April 11, 2011, 05:49:29 pm
Congratulations. Seems really challenging to me !
And at the same time, as you already know, it is totally useless (so please don't be ofended).
As a combination of both I would say your project is a very strange artwork that few people will be able to appreciate.
I think I do smiley
11  International / Español / Un mando a distancia para tanque on: April 10, 2011, 04:38:48 pm
Con control RC digital de las orugas. Todo ello una chapuza espectacular, con protoboards, el arduino fijado con una goma de plástico .. pero se trata de pasar el rato, no ? Si alguien quiere saber algún detalle que pregunte. A ver si me animo a hacer un montaje un poco más decente y le añado algún sensor.

http://frikosal.blogspot.com/2011/04/un-robot-capaz-de-subir-las.html
12  Using Arduino / Motors, Mechanics, and Power / Re: Breadboard RC tracked vehicle with 2 arduinos (video) on: April 10, 2011, 01:44:04 pm
Sweet!
I like how the Arduino hangs off the back slightly... gives it that "Back to the Future Time Delorean" look... if you squint a little. Ok, if you squint a lot.

smiley

The first version was powered by an Arduino nano, it fitted nicely in the breadboard. But the 5V out of the nano was used as the logic power supply for the radio receiver and 293 chip. That was too much for him. I think that the 293 uses too much current from the +5V line, I would expect only a few mA. So after a few minutes the nano was destroyed so I had to reuse an older Arduino board. This second version has a 7805 to power the +5V line from the 6xAA batteries, and it gets slightly hot. I'm looking for a better solution, perhaps a 298 based circuit or one of the pololu breakouts that seem to be better. I would like current sensing to detect colisions.

What did you use the the radio component?
The first idea was xbee but it is expensive. I found on ebay a RX-TX pair, really cheap, that works well with the virtual wire library, if you want I send you the reference.
However I would like it to be bidirectional, so if you have a better solution please let me know.
13  Using Arduino / Motors, Mechanics, and Power / Breadboard RC tracked vehicle with 2 arduinos (video) on: April 09, 2011, 06:25:20 pm
http://youtu.be/113w9Al7Zsc
Breadboard tracked vehicle. The RC controller is made with an Arduino NANO (inside the wooden box) and a 12 keypad. The vehicle uses a Pololu RP5 chassis powered by 6 AA 1.2 batteries. An arduino reads the digital RC signals and decodes them to drive the two motors using a L293D chip. A weekend project, again trying hard to get my sons interested in electronics (and technology in general) instead of waisting time in front of the tv smiley
Writting the codes for the arduinos was fun and the RP5 is amazing, but I'm not so happy with the L293D that tends to use power from the logic inputs and +5V supply. This can be very dangerous. Next step will be a better motor controller.
Comments are welcomed !
I really like the breadboards so please don't be too critic with that smiley
14  International / Español / Re: Una idea para tratar de que los niños se interesen por la tecnología on: April 06, 2011, 05:46:36 am
Gracias !
15  International / Español / Una idea para tratar de que los niños se interesen por la tecnología on: April 05, 2011, 05:53:10 pm
Nada demasiado especial, destripar un viejo coche RC y controlarlo con un Arduino. Aquí lo cuento:
http://frikosal.blogspot.com/2011/04/la-electronica-digital-y-yo.html
Y aquí hay un pequeño vídeo:

Pareció interesarles. Tienen 7 y 9 años y para el próximo fin de semana ya tengo medio preparado un mando a distancia sin cables smiley
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